JP2682655B2 - Manufacturing method of fluororesin molding containing filler - Google Patents
Manufacturing method of fluororesin molding containing fillerInfo
- Publication number
- JP2682655B2 JP2682655B2 JP63215868A JP21586888A JP2682655B2 JP 2682655 B2 JP2682655 B2 JP 2682655B2 JP 63215868 A JP63215868 A JP 63215868A JP 21586888 A JP21586888 A JP 21586888A JP 2682655 B2 JP2682655 B2 JP 2682655B2
- Authority
- JP
- Japan
- Prior art keywords
- filler
- powder
- fluororesin
- sintering
- molded product
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 発明の技術分野 本発明は、内部歪の増大や割れ等を生じさせることな
く、機械的強度および摺動性に優れた充填材含有フッ素
樹脂成形品を製造するための製造方法に関する。Description: TECHNICAL FIELD OF THE INVENTION The present invention is for producing a filler-containing fluororesin molded article excellent in mechanical strength and slidability without causing an increase in internal strain or cracking. It relates to a manufacturing method.
発明の技術的背景ならびにその問題点 フッ素樹脂は、耐熱性および耐薬品性に優れるととも
に、摩擦係数が小さく自己潤滑性を有しているので、摺
動材、管、バルブ、コックなどの成形品として広く使用
されている。Technical background of the invention and its problems Since fluororesin has excellent heat resistance and chemical resistance, and has a small friction coefficient and self-lubricating property, it can be molded into sliding materials, pipes, valves, cocks, etc. Widely used as.
ところでフッ素樹脂単体としては、耐摩耗性が必ずし
も充分ではないため、フッ素樹脂に種々の充填材を添加
して耐摩耗性ならびに機械的強度を改良することが行な
われている。このようなフッ素樹脂中に添加される充填
材としては、ガラス繊維、炭素繊維、グラファイト、二
硫化モリブデン、ブロンズ粉末などの無機系充填材が広
く知られている。By the way, since the wear resistance of the fluororesin itself is not always sufficient, various wear agents have been added to the fluororesin to improve the wear resistance and mechanical strength. Inorganic fillers such as glass fiber, carbon fiber, graphite, molybdenum disulfide, and bronze powder are widely known as fillers added to such a fluororesin.
しかしながら、このような無機系の充填材を含有した
フッ素樹脂成形品にあっては、含有される充填材が原因
となって、摺接する相手部材を摩耗させ、損傷させる虞
があった。However, in the fluororesin molded product containing such an inorganic filler, the included filler may cause abrasion and damage to the mating member in sliding contact.
このような不都合を解消させるために、フッ素樹脂成
形品に含有させる充填材として、ポリアミド樹脂粉末等
の有機系の充填材を用いることが提案されている（特開
昭60−238,351号公報）。In order to eliminate such inconvenience, it has been proposed to use an organic filler such as polyamide resin powder as a filler to be contained in the fluororesin molded article (Japanese Patent Laid-Open No. 60-238,351).
しかしながら、このような有機系の充填材を含有する
フッ素樹脂成形品にあっても、無機系の充填材を含有す
るフッ素樹脂成形品と同様に、その製造に際して、製造
条件によっては、成形品内部に割れが生じたり、成形品
内部に過大な残留ひずみが生じたりする虞があった。However, even in a fluororesin molded product containing such an organic filler, as in the case of a fluororesin molded product containing an inorganic filler, at the time of its manufacture, depending on the manufacturing conditions, the inside of the molded product may be There is a risk that cracks may occur in the resin and excessive residual strain may occur inside the molded product.
本発明者等は、このような充填材を含有するフッ素樹
脂成形品の製造方法について鋭意検討したところ、充填
材粉末とフッ素樹脂粉末との混合物の予備成形圧力と、
充填材粉末の容積含有率とを一定の関係を満足するよう
に決定することで、成形品内部に割れや過大な残留ひず
みを生じさせることなく、機械的強度および耐摩耗性に
優れた充填材含有フッ素樹脂成形品を製造できることを
見出した。The present inventors have made extensive studies on a method for producing a fluororesin molded article containing such a filler, and a preforming pressure of a mixture of the filler powder and the fluororesin powder,
By determining the volume content of the filler powder so as to satisfy a certain relationship, a filler excellent in mechanical strength and wear resistance without causing cracks or excessive residual strain inside the molded product. It has been found that it is possible to manufacture a fluororesin-containing product containing the same.
発明の目的 本発明は、このような実情に鑑みてなされ、成形品内
部に割れや過大な残留ひずみを生じさせることなく、機
械的強度および耐摩耗性に優れた充填材含有フッ素樹脂
成形品を製造することができる製造方法を提供すること
を第１の目的とする。Object of the invention The present invention has been made in view of such circumstances, without causing cracks and excessive residual strain inside the molded product, a filler-containing fluororesin molded product excellent in mechanical strength and wear resistance A first object is to provide a manufacturing method that can be manufactured.
さらに本発明は、摺接する相手部材を過度に摩耗させ
ず、相手部材に対する攻撃性の小さい充填材含有フッ素
樹脂を、成形品内部に割れや過大な残留ひずみを生じさ
せることなく製造することができる製造方法を提供する
ことを第２の目的とする。Furthermore, the present invention does not excessively abrade the mating member that is in sliding contact, and a filler-containing fluororesin that is less aggressive to the mating member can be manufactured without causing cracking or excessive residual strain inside the molded product. A second object is to provide a manufacturing method.
発明の概要 このような上記第１の目的を達成するために、本発明
は、フッ素樹脂粉末と充填材粉末との混合物を予備圧縮
成形した後、得られた予備成形品を焼結して充填材含有
フッ素樹脂成形品を製造する方法において、 前記予備圧縮成形時の成形圧力（Pc）と、フッ素樹脂
粉末および充填材粉末に対する充填材粉末の容積含有率
（Ｃ）とが、次の関係式、 Pc＝K1・Ｃ＋K2［MPa］ （ただし、K1、K2は定数） を満足し、 前記K1、K2は、焼結前の予備成形品の密度と、焼結後
の成形品の密度とが略等しい値になるように決定される
ことを特徴としている。SUMMARY OF THE INVENTION In order to achieve the first object as described above, the present invention provides a method in which a mixture of a fluororesin powder and a filler powder is precompressed and then the obtained preform is sintered and filled. In the method for producing a material-containing fluororesin molded article, the molding pressure (Pc) at the time of the preliminary compression molding and the volume content ratio (C) of the filler powder to the fluororesin powder and the filler powder are expressed by the following relational expression: , Pc = K 1 · C + K 2 [MPa] (where K 1 and K 2 are constants), where K 1 and K 2 are the density of the preform before sintering and the molding after sintering. The feature is that the density of the product is determined so as to be substantially equal.
また、本発明は、上記第２の目的を達成するために、
ポリテトラフルオロエチレンから成るフッ素樹脂粉末と
ポリアラミド繊維から成る充填材粉末との混合物を予備
圧縮成形した後、得られた予備成形品を焼結して充填材
含有フッ素樹脂成形品を製造する方法において、 前記予備圧縮成形時の成形圧力（Pc）と、フッ素樹脂
粉末および充填材粉末に対する充填材粉末の容積含有率
（Ｃ）とが、次の関係式、 Pc＝K1・Ｃ＋K2［MPa］ （ただし、K1＝40.2±4.0、K2＝37.0±3.7）を満足する
ことを特徴としている。Further, in order to achieve the second object, the present invention provides
In a method for producing a filler-containing fluororesin molded article by precompressing a mixture of a fluororesin powder made of polytetrafluoroethylene and a filler powder made of polyaramid fiber, and sintering the obtained preform. The molding pressure (Pc) during the preliminary compression molding and the volume content (C) of the filler powder with respect to the fluororesin powder and the filler powder are expressed by the following relational expression: Pc = K 1 · C + K 2 [MPa] (However, K 1 = 40.2 ± 4.0, K 2 = 37.0 ± 3.7) is characterized.
このような本発明に係る充填材含有フッ素樹脂成形品
の製造方法によれば、予備成形圧力（Pc）と、充填材粉
末の容積含有率（Ｃ）とを所定の関係にすることで、焼
結前の予備成形品の密度と、焼結後の成形品の密度とを
略等しくさせることが可能になり、これにより、焼結時
の成形品に生じる熱膨張や熱収縮を最小限にし、成形品
内部に割れや過大な残留ひずみを生じさせることなく、
機械的強度および耐摩耗性に優れた充填材含有フッ素樹
脂成形品を製造することが可能になる。According to such a method for producing a filler-containing fluororesin molded article according to the present invention, by making the preforming pressure (Pc) and the volume content (C) of the filler powder into a predetermined relationship, It is possible to make the density of the preformed product before binding and the density of the molded product after sintering substantially equal, thereby minimizing the thermal expansion and shrinkage that occur in the molded product during sintering, Without causing cracks or excessive residual strain inside the molded product,
It becomes possible to manufacture a filler-containing fluororesin molded article having excellent mechanical strength and wear resistance.
特に、含有される充填材粉末として、ポリアラミド繊
維を用いた場合には、焼結して得られるフッ素樹脂成形
品の相手部材に対する攻撃性も小さくなり、相手部材を
摩損させる虞も少なくなる。In particular, when polyaramid fiber is used as the contained filler powder, the aggressiveness of the fluororesin molded article obtained by sintering with respect to the mating member is reduced and the mating member is less likely to be worn.
発明の具体的説明 以下、本発明を具体的に説明する。DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described specifically.
本発明では、まず、フッ素樹脂粉末と充填材粉末とを
準備し、それらを所定の配合割合で混合し、混合粉末を
得る。フッ素樹脂粉末を構成するフッ素樹脂としては、
ポリテトラフルオロエチレン（PTFE）、テトラフルオロ
エチレンとパーフルオロアルキルビニルエーテルとの共
重合体であるPFA、テトラフルオロエチレンとヘキサフ
ルオロプロピレンとの共重合体であるFEP、あるいはテ
トラフルオロエチレンとヘキサフルオロプロピレンとパ
ーフルオロアルキルビニルエーテルとの共重合体である
EPEなどが用いられる。好ましくはPTFEが用いられる。
充填材粉末を構成する充填材としては、ガラス繊維、炭
素繊維、グラファイト、二硫化モリブデン、ブロンズ粉
末などの無機系充填材、または芳香族ポリエステル、ポ
リイミド、ポリフェニレン、サルファイド、芳香族ポリ
アミド、ポリアラミドなどの有機系充填材などが用いら
れる。好ましくはポリアラミド繊維が用いられる。得ら
れる充填材含有フッ素樹脂成形品の相手部材に対する攻
撃性が小さくなるからである。In the present invention, first, a fluororesin powder and a filler powder are prepared, and they are mixed at a predetermined mixing ratio to obtain a mixed powder. As the fluororesin that constitutes the fluororesin powder,
Polytetrafluoroethylene (PTFE), PFA which is a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, FEP which is a copolymer of tetrafluoroethylene and hexafluoropropylene, or tetrafluoroethylene and hexafluoropropylene It is a copolymer with perfluoroalkyl vinyl ether
EPE or the like is used. Preferably PTFE is used.
As the filler constituting the filler powder, glass fiber, carbon fiber, graphite, molybdenum disulfide, an inorganic filler such as bronze powder, or aromatic polyester, polyimide, polyphenylene, sulfide, aromatic polyamide, polyaramid, etc. An organic filler or the like is used. Polyaramid fibers are preferably used. This is because the resulting filler-containing fluororesin molded article has less aggression with respect to the mating member.
フッ素樹脂粉末の平均粒径は、フッ素樹脂の種類によ
っても異なるが、一般に１〜60μｍが好ましく、特にPT
FE樹脂粉末の場合には10〜40μｍが好ましい。また、充
填材粉末の各粒子の大きさは、充填材の種類によっても
異なるが、一般にフッ素樹脂粉末と同程度の大きさが好
ましく、特にポリアラミド繊維を充填材として用いる場
合には、平均外径が５〜30μｍであり、平均長さが0.1
〜10mmであることが好ましい。The average particle size of the fluororesin powder varies depending on the type of fluororesin, but generally 1 to 60 μm is preferable, and especially PT
In the case of FE resin powder, 10 to 40 μm is preferable. Further, the size of each particle of the filler powder varies depending on the kind of the filler, but generally, a size similar to that of the fluororesin powder is preferable, and particularly when the polyaramid fiber is used as the filler, the average outer diameter is Is 5 to 30 μm and the average length is 0.1
It is preferably -10 mm.
次に、本発明では、フッ素樹脂粉末と充填材粉末との
混合物を所定の成形圧力（Pc）で予備圧縮成形する。こ
の成形圧力（Pc）は、次式で示されるように、フッ素樹
脂粉末および充填雑粉末に対する充填材粉末の容積含有
率（Ｃ）の関数である。Next, in the present invention, the mixture of the fluororesin powder and the filler powder is precompression-molded at a predetermined molding pressure (Pc). The molding pressure (Pc) is a function of the volume content rate (C) of the filler powder with respect to the fluororesin powder and the miscellaneous powder as shown by the following equation.
Pc＝K1・Ｃ＋K2［MPa］ ただし、K1、K2は定数であり、焼結前の予備成形品の
密度と、焼結後の成形品の密度とが略等しい値になるよ
うに定められる。定数K1、K2の値は、フッ素樹脂の種
類、充填材の種類などによっても異なるが、たとえばフ
ッ素樹脂としてPTFEを用い、充填材としてポリアラミド
繊維を用いる場合には、次のようにして実験的に求めら
れる。Pc = K 1 · C + K 2 [MPa] where K 1 and K 2 are constants so that the density of the preform before sintering and the density of the sintered product after sintering will be approximately equal. Determined. The values of the constants K 1 and K 2 differ depending on the type of fluororesin and the type of filler, but for example, when PTFE is used as the fluororesin and polyaramid fiber is used as the filler, an experiment is performed as follows. Is required.
すなわち、第１図に示すように、充填材としてのポリ
アラミド繊維の含有率Ｃを種々に変化させ、焼結前後の
成形品の密度ρ（縦軸）を、予備成形圧Ｐ（縦軸）の関
数として表わす。焼結後の成形品の密度ρは、図中点線
で示すように、予備成形圧Ｐによらず、ポリアラミド繊
維含有率Ｃのみの関数となる。また、焼結前の予備成形
品の密度ρは、ポリアラミド繊維含有率Ｃと予備成形圧
Ｐとの関数となり、図中実線で示すように右上りの曲線
となる。That is, as shown in FIG. 1, the content C of the polyaramid fiber as the filler is variously changed, and the density ρ (vertical axis) of the molded product before and after sintering is set to the pre-forming pressure P (vertical axis). Expressed as a function. The density ρ of the molded product after sintering is a function of only the polyaramid fiber content C, regardless of the preforming pressure P, as shown by the dotted line in the figure. Further, the density ρ of the preformed product before sintering is a function of the polyaramid fiber content C and the preforming pressure P, and becomes the upper right curve as shown by the solid line in the figure.
このため、焼結前後の成形品の密度ρを略等しくする
ためには、含有率Ｃが等しい条件の点線と実線との交点
を滑らかに結び（図中、一点鎖線）、この曲線における
ポリアラミド繊維含有率Ｃと成形圧力Pcとの関係を、第
２図に示す座標で表わし、定数K1、K2を求めるのであ
る。Therefore, in order to make the densities ρ of the molded products before and after sintering substantially equal, the intersection of the dotted line and the solid line under the condition that the content ratio C is equal is smoothly connected (indicated by the dashed line in the figure), and the polyaramid fiber in this curve The relationship between the content rate C and the molding pressure Pc is represented by the coordinates shown in FIG. 2, and the constants K 1 and K 2 are obtained.
フッ素樹脂としてPTFEを用い、充填材としてポリアラ
ミド繊維を用いた場合に、上述のようにして定数K1、K2
を求めた結果、K1＝40.2±4.0、K2＝37.0±3.7であり、
最も好ましくは、K1＝40.2、K2＝37.0であった。When PTFE is used as the fluororesin and polyaramid fiber is used as the filler, the constants K 1 and K 2 are set as described above.
As a result, K 1 = 40.2 ± 4.0, K 2 = 37.0 ± 3.7,
Most preferably, K 1 = 40.2 and K 2 = 37.0.
本発明では、上述のようにして求められる予備成形圧
力Pcでフッ素樹脂粉末と充填材粉末との混合物を所定形
状に予備圧縮成形し、予備成形品を形成した後、この予
備成形品を焼成し、充填材含有フッ素樹脂成形品を得
る。この焼成温度は、340〜380度であることが好まし
い。このようにして得られた成形品は、そのままの形状
で、もしくは切削加工されて、摺動材、管、バルブ、コ
ック、またはその他の機能材として用いられる。In the present invention, the mixture of the fluororesin powder and the filler powder is precompression-molded into a predetermined shape at the preforming pressure Pc obtained as described above, and after forming the preform, the preform is fired. , A filler-containing fluororesin molded product is obtained. The firing temperature is preferably 340 to 380 degrees. The molded product thus obtained is used as a sliding material, a pipe, a valve, a cock, or other functional material in its original shape or after being cut.
［実施例］ 次に、本発明を、さらに具体的な実施例に基づき説明
するが、本発明は、これら実施例に限定されるものでは
なく、本発明の範囲内で種々に改変することができる。[Examples] Next, the present invention will be described based on more specific examples, but the present invention is not limited to these examples and may be variously modified within the scope of the present invention. it can.
実施例１ 平均粒径25μｍのPTFE粉末と平均径16μｍで平均長さ
5cmのポリアラミド繊維とを、ポリアラミド繊維含有率
が14.9vol％（容積含有率Ｃ＝0.149）の割合で混合し、
その混合物を予備成形圧Pc＝40.2・Ｃ＋37.0＝40.2・0.
149＋37.0≒43［MPa］の圧力で予備圧縮成形し、予備成
形品を得た。この予備圧縮成形には、内径15mmのシリン
ダーと両押式ピストンとから成る金型を用いた。Example 1 PTFE powder having an average particle size of 25 μm and an average length of 16 μm
5 cm of polyaramid fiber was mixed with polyaramid fiber content rate of 14.9 vol% (volume content rate C = 0.149),
Preforming pressure Pc = 40.2 ・ C + 37.0 = 40.2 ・ 0.
Pre-compression molding was performed at a pressure of 149 + 37.0 ≈ 43 [MPa] to obtain a pre-molded product. For this pre-compression molding, a mold composed of a cylinder having an inner diameter of 15 mm and a double-pressing piston was used.
次に、この予備成形品を電気炉で370℃の温度で焼成
し、充填材含有フッ素樹脂成形品を得た。Next, this preform was baked in an electric furnace at a temperature of 370 ° C. to obtain a filler-containing fluororesin mold.
実施例２ ポリアラミド繊維含有率を1.6vol％（容積含有率Ｃ＝
0.016）とし、予備成形圧Pc＝40.2・Ｃ＋37.0＝40.2・
0.016＋37.0≒37.6［MPa］ とした以外は、実施例１と同様にして充填材含有フッ素
樹脂成形品を得た。Example 2 The polyaramid fiber content rate was 1.6 vol% (volume content rate C =
0.016) and preforming pressure Pc = 40.2 ・ C + 37.0 = 40.2 ・
A filler-containing fluororesin molded product was obtained in the same manner as in Example 1 except that 0.016 + 37.0≈37.6 [MPa].
比較例１ 充填材をグラスファイバーとし、充填材の含有率を2
0.0vol％とし、予備成形圧Pcを29.4［MPa］とした以外
は、実施例１と同様にして充填材含有フッ素樹脂成形品
を得た。Comparative Example 1 The filler is glass fiber, and the filler content is 2
A filler-containing fluororesin molded article was obtained in the same manner as in Example 1 except that the content was 0.0 vol% and the preforming pressure Pc was 29.4 [MPa].
比較例１ 充填材を含有させず、予備成形圧Pcを29.4［MPa］と
した以外は、実施例１と同様にして充填材含有フッ素樹
脂成形品を得た。Comparative Example 1 A filler-containing fluororesin molded article was obtained in the same manner as in Example 1 except that the filler was not contained and the preforming pressure Pc was set to 29.4 [MPa].
（実験結果１） 上記実施例1,2、参考例１および比較例１の摩擦距離
ｌに対する摩擦係数μの変化を第３図に示す。図示する
ように、本実施例では、グラスファイバーを充填材とし
て含有した参考例１に比較して、格別に低い摩擦係数を
有し、摺動特性に優れ、その摺動特性が摩擦距離ｌによ
らず略一定であることが確認された。(Experimental Result 1) FIG. 3 shows changes in the friction coefficient μ with respect to the friction distance 1 in Examples 1 and 2 and Reference Example 1 and Comparative Example 1. As shown in the figure, in this example, as compared with Reference Example 1 containing glass fiber as a filler, it has a significantly lower friction coefficient and is excellent in sliding characteristics, and the sliding characteristics vary in the friction distance l. It was confirmed that it was almost constant regardless.
また、上記実施例1,2、参考例１および比較例１に係
る成形品の相手部材に対する攻撃性を確めるために、相
手部材としてアルミニウム板を用い、それと各成形品を
摺動させ、アルミニウム板の摩耗深さを調べた結果を第
４図に示す。図示するように、本実施例では、参考例１
に比較し、アルミニウム板を摩損させず、相手部材に対
する攻撃性が小さいことが確認された。Further, in order to confirm the aggression of the molded articles according to Examples 1 and 2 above, Reference Example 1 and Comparative Example 1 with respect to the mating member, an aluminum plate is used as the mating member, and the molded article is slid with it. The results of examining the wear depth of the aluminum plate are shown in FIG. As shown, in the present embodiment, the reference example 1
It was confirmed that the aluminum plate was not abraded and the aggression with respect to the mating member was smaller than that of No.
さらに、上記実施例1,2および比較例１に係る成形品
自身の耐摩耗性を確めるために、相手部材としてアルミ
ニウム板を用い、それと各成形品を摺動させ、成形品の
摩耗量を調べた結果を表１に示す。表１に示すように、
本実施例に係る成形品の摩耗量は、何も充填されていな
いPTFE単体の成形品（比較例１）に比較して著しく小さ
いことが確認された。Further, in order to confirm the wear resistance of the molded products according to Examples 1 and 2 and Comparative Example 1 above, an aluminum plate was used as a mating member, and the molded product was slid with the aluminum plate, and the wear amount of the molded products was increased. Table 1 shows the results of examination. As shown in Table 1,
It was confirmed that the wear amount of the molded product according to this example was significantly smaller than that of the molded product of PTFE alone which was not filled with anything (Comparative Example 1).
（実験結果２） 実施例1,2と同様なPTFE粒子とポリアラミド繊維を用
い、ポリアラミド繊維含有率を種々に変化させると共
に、予備成形圧力Ｐを、Pc＝40.2・Ｃ＋37.0付近で種々
に変化させた場合に、成形品の破断ひずみ、破断応力、
破断エネルギーがどのように変化するか調べた結果をそ
れぞれ第５〜７図に示す。 (Experimental Result 2) Using the same PTFE particles and polyaramid fibers as in Examples 1 and 2, the polyaramid fiber content was changed variously, and the preforming pressure P was also changed variously near Pc = 40.2 · C + 37.0. If you let it, breaking strain of the molded product, breaking stress,
The results of investigating how the breaking energy changes are shown in FIGS. 5 to 7, respectively.
図示するように、各ポリアラミド繊維含有率に対し
て、予備成形圧力ＰをPc＝40.2・Ｃ＋37.2近傍にした場
合に、それぞれ破断ひずみ、破断応力、破断エネルギー
が最高値に近づくことが確認され、本発明方法により製
造される充填材含有フッ素樹脂成形品の機械的強度が増
大することが確認された。As shown in the figure, for each polyaramid fiber content, it was confirmed that the breaking strain, breaking stress, and breaking energy were close to the maximum values when the preforming pressure P was set to near Pc = 40.2 · C + 37.2. It was confirmed that the mechanical strength of the filler-containing fluororesin molded article produced by the method of the present invention was increased.
発明の効果 以上説明してきたように、本発明によれば、予備成形
圧力（Pc）と、充填材粉末の容積含有率（Ｃ）とを所定
の関係にすることで、焼結前の予備成形品の密度と、焼
結後の成形品の密度とを略等しくさせることが可能にな
り、これにより、焼結時の成形品に生じる熱膨張や熱収
縮を最小限にし、成形品内部に割れや過大な残留ひずみ
を生じさせることなく、機械的強度および耐摩耗性に優
れた充填材含有フッ素樹脂成形品を製造することが可能
になる。EFFECTS OF THE INVENTION As described above, according to the present invention, by making the preforming pressure (Pc) and the volume content (C) of the filler powder into a predetermined relationship, the preforming before sintering is performed. It is possible to make the density of the molded product and the density of the molded product after sintering approximately equal, which minimizes the thermal expansion and shrinkage that occurs in the molded product during sintering, causing cracks inside the molded product. It is possible to produce a filler-containing fluororesin molded article excellent in mechanical strength and wear resistance without causing excessive residual strain.
特に、含有される充填材粉末として、ポリアラミド繊
維を用いた場合には、焼結して得られるフッ素樹脂成形
品の相手部材に対する攻撃性も小さくなり、相手部材を
摩損させる虞も少なくなる。In particular, when polyaramid fiber is used as the contained filler powder, the aggressiveness of the fluororesin molded article obtained by sintering with respect to the mating member is reduced and the mating member is less likely to be worn.
第1,2図は本発明に係る製造方法で用いる関係式Pc＝K1
・Ｃ＋K2の求め方を示すグラフ、第3,4図は本発明の実
施例と参考例あるいは比較例との差異を示すグラフ、第
５〜７図は本発明の作用効果を示すグラフである。1 and 2 show the relational expression Pc = K 1 used in the manufacturing method according to the present invention.
・ Graph showing how to obtain C + K 2 , FIGS. 3 and 4 are graphs showing differences between the examples of the present invention and reference examples or comparative examples, and FIGS. 5 to 7 are graphs showing action and effect of the present invention. .
Claims (3)
素樹脂粉末とポリアラミド繊維から成る充填材粉末との
混合物を予備圧縮成形した後、得られた予備成形品を焼
結して充填材含有フッ素樹脂成形品を製造する方法にお
いて、 前記予備圧縮成形時の成形圧力（Pc）と、フッ素樹脂粉
末および充填材粉末に対する充填材粉末の容積含有率
（Ｃ）とが、次の関係式、 Pc＝40.2・Ｃ＋37.0［MPa］ を満足することを特徴とする充填材含有フッ素樹脂成形
品の製造方法。1. A filler-containing fluororesin molded product obtained by precompressing a mixture of a fluororesin powder made of polytetrafluoroethylene and a filler powder made of polyaramid fiber, and sintering the obtained preformed product. In the method for producing the above, the molding pressure (Pc) during the preliminary compression molding and the volume content (C) of the filler powder with respect to the fluororesin powder and the filler powder are expressed by the following relational expression: Pc = 40.2 · C + 37 0.0 [MPa] is satisfied, The manufacturing method of the fluorocarbon resin molding containing a filler characterized by the above-mentioned.
素樹脂粉末とポリアラミド繊維から成る充填材粉末との
混合物を予備圧縮成形した後、得られた予備成形品を焼
結して充填材含有フッ素樹脂成形品を製造する方法にお
いて、 前記予備圧縮成形時の成形圧力（Pc）と、フッ素樹脂粉
末および充填材粉末に対する充填材粉末の容積含有率
（Ｃ）とが、次の関係式、 Pc＝K1・Ｃ＋K2［MPa］ （ただし、K1＝40.2±4.0、K2＝37.0±3.7）を満足する
ことを特徴とする充填材含有フッ素樹脂成形品の製造方
法。2. A filler-containing fluororesin molded product obtained by precompressing a mixture of a fluororesin powder made of polytetrafluoroethylene and a filler powder made of polyaramid fiber, and sintering the obtained preformed product. In the method for manufacturing the above, the molding pressure (Pc) at the time of the preliminary compression molding and the volume content (C) of the filler powder with respect to the fluororesin powder and the filler powder are expressed by the following relational expression: Pc = K 1 · A method for producing a filler-containing fluororesin molded article, characterized by satisfying C + K 2 [MPa] (where K 1 = 40.2 ± 4.0, K 2 = 37.0 ± 3.7).
予備圧縮成形した後、得られた予備成形品を焼結して充
填材含有フッ素樹脂成形品を製造する方法において、 前記予備圧縮成形時の成形圧力（Pc）と、フッ素樹脂粉
末および充填材粉末に対する充填材粉末の容積含有率
（Ｃ）とが、次の関係式、 Pc＝K1・Ｃ＋K2［MPa］ （ただし、K1、K2は定数） を満足し、 前記K1、K2は、焼結前の予備成形品の密度と、焼結後の
成形品の密度とが略等しい値になるように決定されるこ
とを特徴とする充填材含有フッ素樹脂成形品の製造方
法。3. A method for producing a filler-containing fluororesin molded article by precompressing a mixture of fluororesin powder and filler powder, and sintering the resulting preformed article, wherein the precompression molding is performed. The molding pressure (Pc) at the time and the volume content (C) of the filler powder with respect to the fluororesin powder and the filler powder are expressed by the following relational expression: Pc = K 1 · C + K 2 [MPa] (where K 1 , K 2 is a constant), and K 1 and K 2 are determined so that the density of the preform before sintering and the density of the molded product after sintering are approximately equal. A method for producing a filler-containing fluororesin molded article, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63215868A JP2682655B2 (en) | 1988-08-29 | 1988-08-29 | Manufacturing method of fluororesin molding containing filler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63215868A JP2682655B2 (en) | 1988-08-29 | 1988-08-29 | Manufacturing method of fluororesin molding containing filler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0262228A JPH0262228A (en) | 1990-03-02 |
| JP2682655B2 true JP2682655B2 (en) | 1997-11-26 |
Family
ID=16679597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63215868A Expired - Fee Related JP2682655B2 (en) | 1988-08-29 | 1988-08-29 | Manufacturing method of fluororesin molding containing filler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2682655B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005298554A (en) * | 2004-04-07 | 2005-10-27 | Sumitomo Electric Ind Ltd | Stretched polytetrafluoroethylene porous film having elasticity-restoring property in film thickness direction, its manufacturing method and use of porous film |
| JP2015209480A (en) * | 2014-04-25 | 2015-11-24 | 三井・デュポンフロロケミカル株式会社 | Fluororesin composition |
-
1988
- 1988-08-29 JP JP63215868A patent/JP2682655B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0262228A (en) | 1990-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109851989A (en) | A kind of polyether-ether-ketone composite material and its preparation method and application | |
| WO2019244433A1 (en) | Method for manufacturing fired body of fluororesin, fired body of fluororesin, method for manufacturing fluororesin dispersion, method for manufacturing fired body, fluororesin dispersion, and fired body | |
| JP2682655B2 (en) | Manufacturing method of fluororesin molding containing filler | |
| JPS63242610A (en) | Manufacture of polytetrafluoroethylene sealing part | |
| JPH0437772B2 (en) | ||
| JP2698375B2 (en) | Polytetrafluoroethylene resin composition | |
| US6884481B1 (en) | Motion transmitting cable assemblies having abrasion resistant multi-wall liner | |
| JPH0713171B2 (en) | Tetrafluoroethylene resin composition | |
| JP2003021144A (en) | Resin composite sliding member and manufacturing method of the same | |
| JP2000009228A (en) | Ptfe resin composition | |
| JPH08217941A (en) | Sliding member | |
| JPH0631624B2 (en) | Scroll type compressor seal member | |
| KR102558432B1 (en) | Manufacturing method of sealing material with excellent mechanical properties | |
| JP4350229B2 (en) | Fluororesin gasket | |
| JP3199086B2 (en) | Valve sealing material, method for manufacturing valve sealing material, and valve sealing structure | |
| JP4209484B2 (en) | Sliding carbon material, sealing material using sliding carbon material, and manufacturing method of sliding carbon material | |
| JP2000001589A (en) | Ptfe resin composition | |
| JP4176184B2 (en) | Sliding member for dry gas | |
| JP3543386B2 (en) | Resin composition for sliding members | |
| JPH0625499A (en) | Fluororesin composition | |
| JP3646678B2 (en) | Polyphenylene sulfide resin composition | |
| JPH03277806A (en) | Tube for cable conduit | |
| JP6612001B1 (en) | Fluorine resin fired body production method, fluororesin fired body, fluororesin dispersion production method, fired body production method, fluororesin dispersion, and fired body | |
| JPH06278252A (en) | Multilayer fluororesin molded product and manufacture of the same | |
| JPH01198674A (en) | Sheet gasket |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070808 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080808 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080808 Year of fee payment: 11 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080808 Year of fee payment: 11 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |